jQuery.fn.numeric = function(options){
        var defaults = {
                operador:'',
                decimais:'',
                callback:false,
                valorPadrao:'7777'              
        }
        
        var settings = jQuery.extend(defaults,options);
        
        callback = typeof callback == "function" ? callback : function(){};
        this.keypress(
                function(e){
                        var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
                        // allow enter/return key (only when in an input box)
                        if(key == 27){ // esc
                                esc('fechar');
                                return false;
                        }
                        if(key == 45){
                                return false;
                        }
                        if(key == 13 && this.nodeName.toLowerCase() == "input")
                        {
                                return true;
                        }
                        else if(key == 13)
                        {
                                return false;
                        }
                        var allow = false;
                        // allow Ctrl+A
                        if((e.ctrlKey && key == 97 /* firefox */) || (e.ctrlKey && key == 65) /* opera */) return true;
                        // allow Ctrl+X (cut)
                        if((e.ctrlKey && key == 120 /* firefox */) || (e.ctrlKey && key == 88) /* opera */) return true;
                        // allow Ctrl+C (copy)
                        if((e.ctrlKey && key == 99 /* firefox */) || (e.ctrlKey && key == 67) /* opera */) return true;
                        // allow Ctrl+Z (undo)
                        if((e.ctrlKey && key == 122 /* firefox */) || (e.ctrlKey && key == 90) /* opera */) return true;
                        // allow or deny Ctrl+V (paste), Shift+Ins
                        if((e.ctrlKey && key == 118 /* firefox */) || (e.ctrlKey && key == 86) /* opera */ || (e.shiftKey && key == 45)) return false;
                        // if a number was not pressed
                        if(key < 48 || key > 57)
                        {
                                /* '-' only allowed at start */
                                if(key == 45 && this.value.length == 0) return true;
                                /* only one decimal separator allowed */
                                if(key == settings.operador.charCodeAt(0) && this.value.indexOf(settings.operador) != -1)
                                {
                                        allow = false;
                                }
                                // check for other keys that have special purposes
                                if(
                                        key != 8 /* backspace */ &&
                                        key != 9 /* tab */ &&
                                        key != 13 /* enter */ &&
                                        key != 35 /* end */ &&
                                        key != 36 /* home */ &&
                                        key != 37 /* left */ &&
                                        key != 39 /* right */ &&
                                        key != 46 /* del */
                                )
                                {
                                        allow = false;
                                }
                                else
                                {
                                        // for detecting special keys (listed above)
                                        // IE does not support 'charCode' and ignores them in keypress anyway
                                        if(typeof e.charCode != "undefined")
                                        {
                                                // special keys have 'keyCode' and 'which' the same (e.g. backspace)
                                                if(e.keyCode == e.which && e.which != 0)
                                                {
                                                        allow = true;
                                                }
                                                // or keyCode != 0 and 'charCode'/'which' = 0
                                                else if(e.keyCode != 0 && e.charCode == 0 && e.which == 0)
                                                {
                                                        allow = true;
                                                }
                                        }
                                }
                                // if key pressed is the decimal and it is not already in the field
                                if(key == settings.operador.charCodeAt(0) && this.value.indexOf(settings.operador) == -1)
                                {
                                        allow = true;
                                }
                        }
                        else
                        {
                                allow = true;
                        }
                        return allow;
                }
        ).blur(function(){              
                var valCampo = jQuery(this).val();
                if(valCampo == ',' || valCampo == '.'){
                        return jQuery(this).val(settings.valorPadrao);
                }else{
                        var valFloat = valCampo.replace(',','.');
                        if(valFloat == ''){
                                valFloat = 0;
                        }                       
                        if(parseFloat(valFloat) == 0){
                                return jQuery(this).val(settings.valorPadrao);
                        }
                        if(parseFloat(valFloat) != 0 && settings.decimais > 0){
                                var valorT = parseFloat(valFloat);
                                valorT = number_format(valorT,settings.decimais,settings.operador,'');
                                return jQuery(this).val(valorT);
                        }                                               
                }
        }).bind('mouseout focusin',function(){  
                if(settings.operador == ''){
                        if(!parseInt(jQuery(this).val())){
                                return jQuery(this).val(settings.valorPadrao);
                        }
                }else if(settings.operador == '.'){
                        if(isNaN(jQuery(this).val())){
                                return jQuery(this).val(settings.valorPadrao);
                        }
                }else if(settings.operador == ','){
                        valor = jQuery(this).val().replace(',','.');
                        if(isNaN(valor)){
                                return jQuery(this).val(settings.valorPadrao);
                        }
                }
        });
        return this;
}